WASHINGTON (Reuters) - The United States Postal Service should have more flexibility to raise rates for packages, according to recommendations from a task force set up by President Donald Trump, a move that could hurt profits of Amazon.com Inc (AMZN.O) and other large online retailers. The task force was announced in April to find ways to stem financial losses by the service, an independent agency within the federal government. Its creation followed criticism by Trump that the Postal Office provided too much service to Amazon for too little money.